440 lines
14 KiB
Go
440 lines
14 KiB
Go
package canvas
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import (
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"encoding/json"
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"errors"
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"infinite-canvas/backend/internal/kernel"
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"net/http"
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"strings"
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"time"
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"unicode/utf8"
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"infinite-canvas/backend/internal/model"
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"infinite-canvas/backend/internal/repository"
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"gorm.io/gorm"
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)
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type AssetsSyncRequest struct {
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Assets []json.RawMessage `json:"assets"`
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}
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type UserDataSummary struct {
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ID string `json:"id"`
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FolderID string `json:"folderId,omitempty"`
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Kind string `json:"kind,omitempty"`
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Category string `json:"category,omitempty"`
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Status string `json:"status,omitempty"`
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Title string `json:"title"`
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CreatedAt time.Time `json:"createdAt"`
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UpdatedAt time.Time `json:"updatedAt"`
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Revision int64 `json:"revision,omitempty"`
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SaveAudit *CanvasSaveAudit `json:"-"`
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}
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type CanvasSaveAudit struct {
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NodesBefore int
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NodesAfter int
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}
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func canvasNodeCount(payload string) int {
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var document struct {
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Nodes []json.RawMessage `json:"nodes"`
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}
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_ = json.Unmarshal([]byte(payload), &document)
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return len(document.Nodes)
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}
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type UserDataSnapshot struct {
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Assets []json.RawMessage `json:"assets"`
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Projects []json.RawMessage `json:"projects"`
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}
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func (s *Service) UserDataSnapshot(userID string) (UserDataSnapshot, error) {
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assets, err := s.UserAssets(userID)
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if err != nil {
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return UserDataSnapshot{}, err
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}
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projects, err := s.UserCanvasProjects(userID)
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if err != nil {
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return UserDataSnapshot{}, err
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}
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return UserDataSnapshot{Assets: assets, Projects: projects}, nil
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}
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func (s *Service) UserAssetSummaries(userID string) ([]UserDataSummary, error) {
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assets, err := s.repo.AssetSummaries(userID)
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if err != nil {
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return nil, err
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}
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result := make([]UserDataSummary, 0, len(assets))
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for _, asset := range assets {
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result = append(result, UserDataSummary{ID: asset.ID, FolderID: asset.FolderID, Kind: asset.Kind, Category: string(asset.Category), Status: string(asset.Status), Title: asset.Title, CreatedAt: asset.CreatedAt, UpdatedAt: asset.UpdatedAt})
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}
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return result, nil
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}
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func (s *Service) UserAsset(userID string, id string) (json.RawMessage, error) {
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asset, err := s.repo.AssetForUser(userID, id)
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if err != nil {
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return nil, err
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}
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return ClientAssetPayload(*asset), nil
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}
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func (s *Service) UpsertUserAsset(userID string, raw json.RawMessage) (UserDataSummary, error) {
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asset, err := AssetFromJSON(userID, raw)
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if err != nil {
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return UserDataSummary{}, err
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}
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err = s.host.WithStorageLock(func() error {
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if asset.FolderID != "" {
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if _, err := s.repo.AssetFolderForUser(userID, asset.FolderID); err != nil {
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if errors.Is(err, gorm.ErrRecordNotFound) {
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return kernel.BadAuthRequest("素材分类不存在")
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}
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return err
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}
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}
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existing, existingErr := s.repo.AssetForUser(userID, asset.ID)
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if existingErr != nil && !errors.Is(existingErr, gorm.ErrRecordNotFound) {
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return existingErr
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}
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if existing != nil && existing.PayloadJSON != asset.PayloadJSON {
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if err := s.ValidateAssetCanvasReferences(userID, asset); err != nil {
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return err
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}
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}
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existingBytes := int64(0)
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if existing != nil {
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existingBytes = int64(len([]byte(existing.PayloadJSON)))
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}
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if err := s.host.StructuredQuota(userID, "asset", errors.Is(existingErr, gorm.ErrRecordNotFound), int64(len(raw))-existingBytes); err != nil {
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return err
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}
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if err := s.repo.UpsertAsset(&asset); err != nil {
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return err
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}
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if existingErr != nil {
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s.host.RecordActivity(userID, "asset", 1)
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}
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return nil
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})
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if err != nil {
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return UserDataSummary{}, err
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}
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return UserDataSummary{ID: asset.ID, FolderID: asset.FolderID, Kind: asset.Kind, Category: string(asset.Category), Status: string(asset.Status), Title: asset.Title, CreatedAt: asset.CreatedAt, UpdatedAt: asset.UpdatedAt}, nil
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}
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func (s *Service) DeleteUserAsset(userID string, id string) error {
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return s.host.WithStorageLock(func() error {
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return s.host.DeleteUserAssetWithResources(userID, id)
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})
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}
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func (s *Service) UserAssets(userID string) ([]json.RawMessage, error) {
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assets, err := s.repo.Assets(userID)
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if err != nil {
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return nil, err
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}
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result := make([]json.RawMessage, 0, len(assets))
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for _, asset := range assets {
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if payload := ClientAssetPayload(asset); len(payload) > 0 {
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result = append(result, payload)
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}
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}
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return result, nil
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}
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func (s *Service) ReplaceUserAssets(userID string, req AssetsSyncRequest) ([]json.RawMessage, error) {
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assets := make([]model.Asset, 0, len(req.Assets))
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var totalBytes int64
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for _, raw := range req.Assets {
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item, err := AssetFromJSON(userID, raw)
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if err != nil {
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return nil, err
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}
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assets = append(assets, item)
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totalBytes += int64(len(raw))
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}
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err := s.host.WithStorageLock(func() error {
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if err := s.ValidateAssetReplacementCanvasReferences(userID, assets); err != nil {
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return err
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}
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if err := s.host.StructuredReplacementQuota(userID, "asset", len(assets), totalBytes); err != nil {
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return err
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}
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if err := s.repo.ReplaceAssets(userID, assets); err != nil {
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return err
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}
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if len(assets) > 0 {
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s.host.RecordActivity(userID, "asset", len(assets))
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}
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return nil
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})
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if err != nil {
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return nil, err
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}
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return s.UserAssets(userID)
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}
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func (s *Service) UserCanvasProjects(userID string) ([]json.RawMessage, error) {
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projects, err := s.repo.CanvasProjects(userID)
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if err != nil {
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return nil, err
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}
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result := make([]json.RawMessage, 0, len(projects))
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for _, project := range projects {
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if strings.TrimSpace(project.PayloadJSON) != "" {
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payload, err := canvasProjectPayload(project)
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if err != nil {
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return nil, err
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}
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result = append(result, payload)
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}
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}
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return result, nil
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}
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func (s *Service) UserCanvasProjectSummaries(userID string) ([]UserDataSummary, error) {
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projects, err := s.repo.CanvasProjectSummaries(userID)
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if err != nil {
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return nil, err
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}
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result := make([]UserDataSummary, 0, len(projects))
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for _, project := range projects {
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result = append(result, UserDataSummary{ID: project.ID, Title: project.Title, CreatedAt: project.CreatedAt, UpdatedAt: project.UpdatedAt, Revision: project.Revision})
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}
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return result, nil
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}
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func (s *Service) UserCanvasProject(userID string, id string) (json.RawMessage, error) {
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project, err := s.repo.CanvasProjectForUser(userID, id)
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if err != nil {
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return nil, err
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}
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return canvasProjectPayload(*project)
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}
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func (s *Service) UpsertUserCanvasProject(userID string, raw json.RawMessage) (UserDataSummary, error) {
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return s.upsertUserCanvasProjectWithHistory(userID, raw, "automatic")
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}
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func (s *Service) upsertUserCanvasProjectWithHistory(userID string, raw json.RawMessage, reason string) (UserDataSummary, error) {
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var version struct {
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Revision *int64 `json:"revision"`
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}
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if err := json.Unmarshal(raw, &version); err != nil {
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return UserDataSummary{}, kernel.BadAuthRequest("画布版本格式错误")
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}
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if version.Revision == nil {
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return UserDataSummary{}, kernel.NewAppError(http.StatusPreconditionRequired, "缺少画布版本，请保留本地草稿后重新加载画布")
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}
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if *version.Revision < 0 || *version.Revision >= 9007199254740991 {
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return UserDataSummary{}, kernel.BadAuthRequest("画布版本无效")
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}
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project, err := canvasProjectFromJSON(userID, raw)
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if err != nil {
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return UserDataSummary{}, err
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}
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var audit CanvasSaveAudit
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err = s.host.WithStorageLock(func() error {
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if err := s.ValidateCanvasMediaAssets(userID, raw); err != nil {
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return err
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}
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existing, existingErr := s.repo.CanvasProjectForUser(userID, project.ID)
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if existingErr != nil && !errors.Is(existingErr, gorm.ErrRecordNotFound) {
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return existingErr
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}
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existingBytes := int64(0)
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project.Revision = *version.Revision
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project.UpdatedAt = time.Now().UTC()
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if existing != nil {
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existingBytes = int64(len([]byte(existing.PayloadJSON)))
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project.CreatedAt = existing.CreatedAt
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}
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if (existing == nil && project.Revision != 0) || (existing != nil && project.Revision != existing.Revision) {
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return canvasRevisionConflict()
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}
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var payload map[string]json.RawMessage
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if err := json.Unmarshal(raw, &payload); err != nil {
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return err
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}
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delete(payload, "revision")
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delete(payload, "remoteContentHash")
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payload["viewport"] = json.RawMessage(`{"x":0,"y":0,"k":1}`)
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if existing != nil {
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var previous map[string]json.RawMessage
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if json.Unmarshal([]byte(existing.PayloadJSON), &previous) == nil && previous["viewport"] != nil {
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payload["viewport"] = previous["viewport"]
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}
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}
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payload["createdAt"], _ = json.Marshal(project.CreatedAt)
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payload["updatedAt"], _ = json.Marshal(project.UpdatedAt)
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cleaned, err := json.Marshal(payload)
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if err != nil {
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return err
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}
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project.PayloadJSON = string(cleaned)
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if err := s.host.StructuredQuota(userID, "canvas", errors.Is(existingErr, gorm.ErrRecordNotFound), int64(len(cleaned))-existingBytes); err != nil {
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return err
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}
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if err := SaveDocumentWithHistory(s.repo, existing, &project, reason); err != nil {
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if errors.Is(err, repository.ErrCanvasRevisionConflict) {
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return canvasRevisionConflict()
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}
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if errors.Is(err, repository.ErrCanvasHistoryResourceMissing) {
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return kernel.NewAppError(http.StatusConflict, "画布引用的素材已变化，当前内容未被覆盖，请保留草稿并重新加载")
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}
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return err
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}
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audit.NodesAfter = canvasNodeCount(project.PayloadJSON)
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if existing != nil {
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audit.NodesBefore = canvasNodeCount(existing.PayloadJSON)
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}
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if existingErr != nil || existing.PayloadJSON != project.PayloadJSON || existing.Title != project.Title {
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s.host.RecordActivity(userID, "canvas", 1)
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}
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return nil
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})
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if err != nil {
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return UserDataSummary{}, err
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}
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return UserDataSummary{ID: project.ID, Title: project.Title, CreatedAt: project.CreatedAt, UpdatedAt: project.UpdatedAt, Revision: project.Revision, SaveAudit: &audit}, nil
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}
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func (s *Service) DeleteUserCanvasProject(userID string, id string) error {
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return s.repo.DeleteCanvasProject(userID, id)
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}
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func AssetFromJSON(userID string, raw json.RawMessage) (model.Asset, error) {
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if err := ValidateSyncedPayload(raw, "素材"); err != nil {
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return model.Asset{}, err
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}
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var payload struct {
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ID string `json:"id"`
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FolderID string `json:"folderId"`
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Kind string `json:"kind"`
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Category string `json:"category"`
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Status string `json:"status"`
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PrimaryVersionID string `json:"primaryVersionId"`
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Title string `json:"title"`
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CreatedAt string `json:"createdAt"`
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UpdatedAt string `json:"updatedAt"`
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}
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if err := json.Unmarshal(raw, &payload); err != nil {
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return model.Asset{}, kernel.BadAuthRequest("素材数据格式错误")
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}
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now := time.Now()
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createdAt := parseClientTime(payload.CreatedAt, now)
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updatedAt := parseClientTime(payload.UpdatedAt, createdAt)
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id := strings.TrimSpace(payload.ID)
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if id == "" {
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id = kernel.NewID()
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}
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if utf8.RuneCountInString(id) > model.AssetIDMaxLength {
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return model.Asset{}, kernel.BadAuthRequest("素材 ID 不能超过 80 个字符")
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}
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primaryVersionID := strings.TrimSpace(payload.PrimaryVersionID)
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if utf8.RuneCountInString(primaryVersionID) > 36 {
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return model.Asset{}, kernel.BadAuthRequest("素材主版本 ID 不能超过 36 个字符")
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}
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if err := validateUserAssetDocument(raw); err != nil {
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return model.Asset{}, err
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}
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category := model.NormalizeAssetCategory(model.AssetCategory(payload.Category), payload.Kind)
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status := model.AssetVersionStatus(strings.TrimSpace(payload.Status))
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if status == "" {
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status = model.AssetVersionStatusConfirmed
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}
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return model.Asset{
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ID: id,
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UserID: userID,
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FolderID: strings.TrimSpace(payload.FolderID),
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Kind: strings.TrimSpace(payload.Kind),
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Category: category,
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Status: status,
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PrimaryVersionID: primaryVersionID,
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Title: strings.TrimSpace(payload.Title),
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PayloadJSON: string(raw),
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CreatedAt: createdAt,
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UpdatedAt: updatedAt,
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}, nil
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}
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func canvasProjectFromJSON(userID string, raw json.RawMessage) (model.CanvasProject, error) {
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if err := ValidateSyncedPayload(raw, "画布"); err != nil {
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return model.CanvasProject{}, err
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}
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var payload struct {
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ID string `json:"id"`
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Title string `json:"title"`
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ProjectID string `json:"projectId"`
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CreatedAt string `json:"createdAt"`
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UpdatedAt string `json:"updatedAt"`
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}
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if err := json.Unmarshal(raw, &payload); err != nil {
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return model.CanvasProject{}, kernel.BadAuthRequest("画布数据格式错误")
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}
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now := time.Now()
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createdAt := parseClientTime(payload.CreatedAt, now)
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updatedAt := parseClientTime(payload.UpdatedAt, createdAt)
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id := strings.TrimSpace(payload.ID)
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if id == "" {
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id = kernel.NewID()
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}
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return model.CanvasProject{
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ID: id,
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UserID: userID,
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ProjectID: strings.TrimSpace(payload.ProjectID),
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Title: strings.TrimSpace(payload.Title),
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PayloadJSON: string(raw),
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CreatedAt: createdAt,
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UpdatedAt: updatedAt,
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}, nil
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}
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func ValidateSyncedPayload(raw json.RawMessage, label string) error {
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if len(raw) > 4<<20 {
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return kernel.BadAuthRequest(label + "数据超过 4MB，请先把媒体文件保存到资源存储")
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}
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var payload interface{}
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if err := json.Unmarshal(raw, &payload); err == nil && ContainsInlineMediaDataURL(payload) {
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return kernel.BadAuthRequest(label + "数据包含内嵌媒体，请先上传到资源存储")
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}
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return nil
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}
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// 同步数据只禁止作为字段值存在的媒体 Data URL；提示词和上游错误文案可能合法提到相同字符串。
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func ContainsInlineMediaDataURL(value interface{}) bool {
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switch item := value.(type) {
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case string:
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text := strings.ToLower(strings.TrimSpace(item))
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return strings.HasPrefix(text, "data:image/") || strings.HasPrefix(text, "data:video/") || strings.HasPrefix(text, "data:audio/")
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case []interface{}:
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for _, child := range item {
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if ContainsInlineMediaDataURL(child) {
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return true
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}
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}
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case map[string]interface{}:
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for _, child := range item {
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if ContainsInlineMediaDataURL(child) {
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return true
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}
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}
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}
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return false
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}
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func parseClientTime(value string, fallback time.Time) time.Time {
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value = strings.TrimSpace(value)
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if value == "" {
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return fallback
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}
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if parsed, err := time.Parse(time.RFC3339Nano, value); err == nil {
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return parsed
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}
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return fallback
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}
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